Ever had that panicky feeling when you are in bed, supposed to be asleep because you have something important to do the next day, and you need to sleep but you just can't?
The more you worry about getting to sleep, the more difficult it seems to sleep. An all too familiar cycle has been set up.
Your fight or flight response has been triggered by the stress hormones racing through your body. These stop you relaxing into sleep mode and so you lie awake, tossing and turning, getting more worried every time you look at the time and see the hours racing past.
Usually you fall into an exhausted sleep not long before you have to get up. This leaves you tired and irritable for the rest of the day. Not ideal when you have an interview / presentation / performance.
The human body and brain can only cope with a certain amount of sleep deprivation before they start to be affected.
Clumsiness, reduced reaction times, blurry vision, headaches ... the list goes on.
If this carries on, a negative sleep cycle is set up and an ongoing disturbed pattern ensues.