In the past I would trade U.S. Then sleep from 8:00 p.m. to 1:00 a.m. edt. Then get up and trade Europe into the U.S. Session. 5 hours sleep would be enough. But it does get rough towards the end of the week. In my younger days I would do the 24 hour thing, except I was done trading at 4:15 p.m. From 4:16 pm. until 9:29 a.m. the next day I was doing what 98% of traders did in Chicago on a Thursday night. Believe it or not that gets old as well. On a serious note set your alarm for 2 am or whatever, check charts. If your set ups are well defined you should be able to tell quickly if there is anything to do or not. If not go back to sleep.
As far as the in between times.....do whatever you think will keep you occupied and keep you from doing trades you shouldn't be. I bs with other traders......go on the internet...I have a few good trading books around I always look through again and again. I think I have read Market Wizards I and II a few times each year.
The patience thing is slow. But in my opinion it is what will separate you from the others out there. Some people on here whine that only 5% of traders make it. Who knows. That could be true. But I would be willing to bet a huge part of that 5% have unbelievable patience. I used to trade a lot more years ago. I was amazed how much better the results were if I just waited for set ups and did much bigger size on those fewer trades. The difference was huge.