Sleep isn’t a problem that you should worry about. On the topic about cancer, many who had it will attest that they slept poorly with plenty of sleepless nights while doing chemotherapy, were in pain or plainly worried sick about dying yet many also survived it and their conditions went into remission. They were many also who had advanced stages of the disease, were so sick so they just kept sleeping all the time and they didn’t make it. So what gives here? Your preconditioned mentality about sleep has caused you to make an unsubstantiated and unwarranted connection between sleep and your overall health when none really exists. In any healthy person, a lack of sleep can only exist momentarily. The body will almost certainly make up for it over time so the average sleep duration over a longer time period will converge towards a number, which is usually between 5.5 and 6.5. If you think of missing sleep temporarily as missing a meal because you were too busy or just weren’t hungry at the time, ask yourself if this is something you should spend the rest of the day worried about, or should you just let it be because the shortfall will eventually catch up as there is NO WAY your body can do it wrong. There is nothing you can do about your sleep in the same way you can’t do anything about your appetite, what you can do is just play along and see where it takes you. If someone or something had no concept about sleep, and its alleged effects, perhaps like a baby or a pet cat, did you think they would regard it as a problem? The answer is NO because they slept whenever they felt like it and seem healthy so where is the problem??