Why Sleep Is Foundational to Mental Health (And How to Sleep Better)

If there were one behavior I wish more people protected like therapy, nutrition, or movement—it would be sleep.

Sleep is not passive. It is an active, dynamic biological process that restores the brain and body in ways we are still uncovering. When sleep is disrupted, it doesn’t just make us tired. It impacts brain plasticity, stress regulation, inflammation, immune functioning, mood, and behavior.

In short: sleep affects everything.

Sleep, Stress & the Brain

When we consistently under-sleep, the body can enter a state called allostatic overload—a chronic stress burden that strains the nervous system. Over time, this state can impair:

• Brain neuroplasticity (the brain’s ability to adapt, learn, and heal)

• Stress-response systems (like the HPA axis)

• Immune pathways

• Inflammatory regulation

This matters for mental health. Chronic sleep disruption has been linked to anxiety, depression, irritability, attention difficulties, and increased emotional reactivity.

The hopeful news?

Research suggests that treating insomnia may not only restore healthier sleep patterns, but may also positively influence stress systems, neuroinflammation, and even brain plasticity.

Less sleep → more stress.

Better sleep → greater resilience.

We can probably feel the effects of sleep deprivation...forgetfulness, irritability, brain fog, lower mood...the list goes on!

Sleep is important for us and for our children.

Sleep & Brain Development in Adolescents

Adolescents sleep nearly one-third of their day. Sleep is a core developmental behavior.

It actively supports:

• Brain maturation

• Executive functioning

• Emotional regulation

• Academic performance

• Behavioral outcomes

Sleep isn’t “lost time.” It’s the biological foundation that makes waking cognition possible.

Maybe for those that are parents, we can begin to rethink sleep as necessary instead of a luxury or a "I'll get to it when the season slows down".

Sleep & Mental Health in Young Adults

Global sleep quality—meaning both measurable sleep factors (like duration and time to fall asleep) and subjective experiences (like feeling restored and enthusiastic for daytime activity)—is strongly associated with mental health in university students.

Even among generally healthy sleepers, perceived sleep quality can predict mood, stress tolerance, and cognitive clarity.

Sleep & Childhood Behavior

Children with more fragmented nighttime sleep show higher rates of:

• Aggression

• Attention challenges

• Withdrawal

• Somatic complaints

• Anxiety and depressive symptoms

• Social functioning difficulties

• 

Sleep fragmentation has been linked to both externalizing behaviors (acting out) and internalizing symptoms (anxiety, low mood).

When children struggle behaviorally, sleep is often an overlooked starting point.

So… How Can We Sleep Better?

The goal isn’t perfection. It’s consistency and nervous system support.

Here are evidence-informed ways to improve sleep quality:

1. Wind Down (Especially for Kids)

A true wind-down period matters.

For children, this means:

• No roughhousing before bed

• Avoid stimulating play

  
  

Physical excitement raises internal body temperature and adrenaline, making it harder to become drowsy.

For adults:

• Shift into low-stimulation activities

• Dim lights

• Reduce emotional activation

• Don't work out too close to bedtime

Think: gentle, predictable, repetitive.

2. Create a Nighttime Ritual

Our nervous system thrives on cues.

A consistent bedtime routine signals safety and predictability.

Examples:

• Read the same book or listen to the same calming song

• Take a warm bath

• Stretch gently

• Practice slow breathing

• Pray or reflect

• Prepare your space for sleep

  

If you have children, prepare for sleep together. Shared routines create co-regulation and safety.

3. Reserve the Bed for Sleep

Your brain builds associations.

When the bed becomes:

• A workspace

• A scrolling zone

• A play area

…it weakens the sleep cue.

For adults: no work in bed.

For kids: keep play in the living room.

Let the bedroom mean one thing: rest.

4. Manage Light Exposure

Research published in The Journal of Clinical Endocrinology & Metabolism shows that light exposure reduces melatonin—the hormone that prepares us for deep sleep.

To support melatonin production:

• Avoid bright overhead lights in the evening

• Reduce screen exposure 1–2 hours before bed

• Consider warm, dim lighting

Light tells the brain “wake up.” Darkness says “it’s safe to sleep.”

5. Use Warm Water Strategically

A warm shower or bath before bed can:

• Relax muscles

• Lower heart rate

• Reduce blood pressure

• Signal parasympathetic (rest-and-digest) activation

As your body cools afterward, it promotes drowsiness.

6. Be Mindful of Caffeine & Alcohol

Caffeine consumed in the evening can significantly disrupt sleep. Research from the Journal of Clinical Sleep Medicine recommends avoiding coffee at least six hours before bedtime.

Alcohol may make you sleepy initially—but it:

• Disrupts melatonin

• Fragments sleep cycles

• Interferes with REM sleep

• Impacts circadian rhythm

It often leads to lighter, less restorative sleep.

Sleep as Mental Health Care

As a therapist, I often ask about sleep before diving into cognitive or emotional strategies. When sleep improves, many symptoms soften:

• Emotional reactivity decreases

• Concentration improves

• Mood stabilizes

• Stress feels more manageable

Sleep supports neuroplasticity—the brain’s capacity to change. It reduces neuroinflammation. It regulates stress pathways and immune function.

It is not a luxury. It is foundational.

If you are struggling with sleep, you are not weak or failing. You may be carrying more stress than your nervous system can handle alone.

And sometimes, improving sleep becomes the first step in healing everything else.

If sleep feels chronically disrupted, insomnia-focused therapy or stress-regulation work can make a significant difference. Reach out if you’d like support in restoring both rest and resilience

Yours truly,

Rachel Moss

LPCC

Citations:

Drake, C., Roehrs, T., Shambroom, J., & Roth, T. (2013). Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine, 9(11), 1195–1200. https://doi.org/10.5664/jcsm.3170

Durand, V. M. (2014). Sleep better! A guide to improving sleep for children with special needs (Revised ed.). Brookes Publishing.

Gooley, J. J., Chamberlain, K., Smith, K. A., Khalsa, S. B., Rajaratnam, S. M., Van Reen, E., Zeitzer, J. M., Czeisler, C. A., & Lockley, S. W. (2011). Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans. The Journal of Clinical Endocrinology & Metabolism, 96(3), E463–E472. https://doi.org/10.1210/jc.2010-2098

Gregory, A. M., & Sadeh, A. (2012). Sleep, emotional and behavioral difficulties in children and adolescents. Sleep Medicine Reviews, 16(2), 129–136. https://doi.org/10.1016/j.smrv.2011.03.007

Palagini, L., Hertenstein, E., Riemann, D., & Nissen, C. (2022). Sleep, insomnia and mental health. Journal of Sleep Research, 31(4), e13628. https://doi.org/10.1111/jsr.13628

Tarokh, L., Saletin, J. M., & Carskadon, M. A. (2016). Sleep in adolescence: Physiology, cognition and mental health. Neuroscience & Biobehavioral Reviews, 70, 182–188. https://doi.org/10.1016/j.neubiorev.2016.08.008