I have been hearing for ten years now about how a day of rest in April makes you less tired in October. Not buying it. 67 years of moving around this earth including years in the Marines when activity patterns were, to say the least, beyond my control, is my claim to expertise in this area. Maybe, just maybe, ten hours of sleep on Monday will help you reel less tired on Wednesday after five hours off sleep on Tuesday, but lower than that: fuggedaboutit!.