"a person who is sleep deprived has no idea how functionally impaired he or she truly is. Most of us have forgotten what it really feels like to be awake." I c

"a person who is sleep deprived has no idea how functionally impaired he or she truly is. Most of us have forgotten what it really feels like to be awake." I can attest to this. I went through a months-long phase where I got about four to five hours of sleep a night, mostly because I was going to bed around 4 or 5 AM. Only after I began going to bed at a more reasonable time and getting more sleep did I realize how much my mood had suffered and how much worse my ability to concentrate and solve problems had been.