sleep state misperception

Awake or Asleep?
It can be hard to tell whether you are awake or asleep, particularly for people with insomnia. How can this happen?
Sleep Talk: Episode 57 – Awake or Asleep?
At times it can be hard to tell whether you have gone to sleep or not, or how much you have slept. This can be a particular problem for people with insomnia.