Insomnia and Mental Health: Why Sleep and Mood Are Tied Together

By Dr. Osamede Edokpolo, MD — board-certified adult psychiatrist, Minds Matters MD LLC

If you have spent nights lying awake watching the clock, you know poor sleep is not just about feeling tired the next day. In my practice in Springfield, with telehealth across Missouri, sleep is one of the first things I ask about. When sleep suffers, mood and focus often suffer with it — and when mood is struggling, sleep is often one of the first things to change.

Insomnia means trouble falling asleep, staying asleep, or waking much earlier than you want. It becomes more concerning when it happens often, lasts for weeks, and affects your energy, patience, work, and ability to enjoy things.

With depression, the relationship goes both ways. Low mood can bring early-morning waking or sleep that never feels restful. In turn, ongoing lack of sleep can deepen low mood, dull motivation, and make it harder to think clearly or cope. Sometimes a change in sleep is an early sign depression is returning.

Anxiety works in a similar loop. A worried mind is hard to switch off at bedtime, and the day's conversations and tomorrow's worries tend to surface as soon as the house gets quiet. A poor night then leaves you tired and on edge, which can make anxiety feel stronger, and bed can feel like a place of frustration rather than rest.

Sleep also matters in ADHD. Adults with ADHD often describe a busy mind at night and trouble winding down at a consistent time. Poor sleep can worsen inattention, forgetfulness, and irritability, which can look like ADHD itself getting worse. Sorting out what is sleep and what is attention takes careful listening.

In bipolar disorder, sleep deserves special attention. A reduced need for sleep — feeling wired or unusually energetic on very little sleep — is different from ordinary insomnia, where you want to sleep but cannot. If you live with bipolar disorder, a sudden change in sleep, mood, or energy is worth raising promptly.

A good evaluation looks at the whole picture. I ask about medical causes that can disrupt sleep, such as pain, breathing problems during sleep, thyroid or other health conditions, and restless legs. I review medications and substances such as caffeine, alcohol, and nicotine, which can interfere with sleep even when they seem to help at first. I also ask about habits and schedules: wake and bed times, naps, screen use, and work hours.

One approach I discuss often is CBT-I, cognitive behavioral therapy for insomnia, generally considered a first-line approach for chronic insomnia. CBT-I looks at thoughts and habits that keep insomnia going — spending long stretches awake in bed, worrying about sleep, or keeping an irregular schedule — and works on changing them step by step.

Some basic habits support almost any plan. Keep a regular wake time, even on weekends. Get daylight and movement during the day. Keep the bedroom cool, dark, and quiet, and reserve the bed mainly for sleep. Wind down before bed, limit caffeine later in the day and alcohol in the evening, and if you cannot sleep after a while, get up, do something quiet in low light, and return to bed when sleepy.

People sometimes ask about sleep medicines. Sedative sleep medicines are used cautiously and with monitoring. They can cause next-day grogginess, affect balance and thinking, and interact with other medicines and alcohol. With regular use, the body can become accustomed to them, making it harder to stop. Decisions about them belong in an individual evaluation, with regular follow-up if they are part of a plan.

If poor sleep has become a pattern, you do not have to simply push through it. A careful evaluation can help sort out what may be driving your insomnia and what next steps make sense for you.

To request an appointment, call 844-476-6600 or use the request form at mindsmattersmd.com/appointment, and our office will confirm your appointment with you.

This post is for general education only and is not medical advice. It does not create a doctor–patient relationship, and it is not a substitute for an individual evaluation.