I work 3rd shift and have for almost 7 years now. After this amount of time I have zero problems sleeping when I want/need to. I have even learned to reverse my schedule on vacations and long weekends. My question is, starting a few months ago I have had major problems with sleeping far too much. I will get out of work roughly 6am on a Friday morning and stay up til the early night. I will then wake up in the early AM on Saturday in order to have a day of "normal" life. I've done this for years. Starting a few months ago, instead of waking up Saturday morning...I will sleep until Sunday morning! I will sleep roughly 30-36 hours in one shot. I know that I am "stretching" myself when I stay awake so long on a Thursday into Friday( wake up Thurs at 9pm and go to bed about 8-10pm friday) but I've done this for years.Why now does it affect me so poorly and cause me to sleep ungodly amounts of time in exchange? I am almost 25 years old with no prior medical conditions aside from mild depression that I all but got rid of in my late teen years. It seldom effects me but it still does once a month or so, more in the winter months which I understand. I conciser myself to be in above average health.