Racing thoughts keeping you awake? Learn the science behind why your brain stays active at bedtime and what you can do about it.
Sleep onset is the transition from wakefulness to sleep. It is not a moment. It is a process. Most people think falling asleep happens when your eyes close or when you stop thinking. In reality, sleep onset is a measurable neurophysiological shift involving the brain, nervous system, and body moving from an alert state into early sleep. Understanding sleep onset matters because many sleep problems do not happen during sleep. They happen before sleep begins.