I have to agree with valen, you must not have kids! My son was colic and had acid refux horrible. I think in the first 3 months i got 2 hours of sleep a night. I was never n* but i had crazy thoughts! Sleep deprivation does crazy things to your brain. I cried to my father every day. Now here we are 3 1/2 years later and he still is horrible at night, twisting and turning, calling for me. I prob get 4 hours a night now. And not in a row tho. I guess you adapt after a while, i have days im really tired and then i have days im fine. Never felt n* from it