I'm kind of the first type, I just wake up every day around the same time. I'm always ok in the morning (relatively no difference between getting 3 or 8 hours o

I'm kind of the first type, I just wake up every day around the same time. I'm always ok in the morning (relatively no difference between getting 3 or 8 hours of sleep), but after lunch there is quite a difference depending on how much sleep I had the previous day. I have to make a decision and go to bed at the right time, otherwise I lose the next day's afternoon.