Here's something researchers have been quietly excited about: treating insomnia doesn't just help you sleep better — it can also meaningfully reduce depression and anxiety.
A 2022 review of high-quality clinical trials looked at what happens when people with depression, anxiety, or PTSD receive CBT for insomnia (called CBT-I). The short version? Fixing sleep problems had ripple effects on mood. Participants not only slept better — their depression and anxiety symptoms improved too, even when those weren't directly targeted.
This matters because sleep and mental health are deeply connected. When you're not sleeping well, everything feels harder — concentration, motivation, emotional resilience. Many people with depression have poor sleep as a central symptom, and it creates a vicious cycle: bad mood makes sleep harder, poor sleep makes mood worse.
CBT-I works differently from sleeping tablets. It involves identifying the thoughts and habits that interfere with sleep — like lying awake worrying, or spending too much time in bed — and systematically changing them. And crucially, it works without the side effects that can come with medication.
If depression and poor sleep are both part of your day-to-day, it might be worth speaking to a psychologist about treating both together.