–noun

1.	the act of depriving.

2.	the fact of being deprived.

3.	dispossession; loss.

4.	removal from ecclesiastical office.

 

Definition:	lack
Synonyms:	deprival, destitution, detriment, distress, expropriation, loss, privation, removal, withdrawal, withholding

Antonyms:

abundance, excess, extra, plenty, surplus

Sleep deprivation is when you don't sleep. Either because you are excited about something, because you just had a baby (they cry a lot...), because of noise, stress, and because sometimes, you just can't sleep. These things can really effect your brain, in a lot of different ways.