Interesting question, I don't think it will seem like 8 hours rest for each day because I think that you need a good amount of time to sleep around 7 hours each night. As each day takes up energy, your body will need to rest and process the day's thoughts, so it needs a good amount of sleep to recharge for the next day. If it gets a good amount of sleep on one night like 10 hours for example then it will have a lot of energy but it if it has 6 hours the next day, then it won't have had enough time to recharge for the next day.