Certainly sleep can be a problem during the series of treatments but I finished my last chemo seven months ago. I'm finding I need less sleep than I used to need.
I consistently go to bed around midnight or later and awaken at 5:30, ready to get up and about. That's difficult because Hubby is still asleep and I do not want to disturb his sleep by banging around in the kitchen. (You have no idea how how much noise you make at 5:30 am by setting a coffee cup down on the counter.)
Lately, I've been doing that...getting up the moment my eyes fly open. And I feel fresh for the day, even at 5:30 in the morning.
That's not even six hours of sleep. Some days I'll take a short nap. But still, the daily hours of sleep are less than 7 hours.
It's weird. I'm blaming my short sleep hours either on cancer or age. Take your choice. Either way I kinda like it.