Check this out in regards to the ongoing things that are being found regarding how not sleeping at night damages health.
The ideal sleep schedule is that by midnight you have gotten half your sleep for the night. That is, go to sleep at 8 PM, get your deepest, most regenerative sleep in the hours before midnight, and then wake up refreshed around 4 am. OK realistically, most people won’t attain this idea sleep schedule unless they are Amish but the closer you can get to it the better. If a healthy person’s body suffers damage by being up all night and whacking out their circadian rhythm, then it can certainly keep a sick person sick or make their health decline regardless of whatever else they try. Sleep is one of the 4 cornerstone- pillars of health. Remove one pillar and the building will partially collapse. ~ Jack