I had a problem sleeping well. Doc referred me to sleep study clinic to have a study done on myself. Staff said my brain was waking up several times an hour. I was totally surprised. Didn't even know that was possible. They got me a CPAP so I wouldn't die. CPAP pushes a steady stream air/oxygen through the mouth and nose so the person won't stop breathing in their sleep. People can die in their sleep from breathing problems and gasping for air and it can keep waking them up too. Now I take Trazodone too. Best sleep of my life. Lack of good sleep can cause lack of energy, irritability, depression, lack of ability to focus or getting as much done during the day etc.