I've had trouble sleeping since a motorcycle accident and a TBI, my sleep schedule is pretty fucked up as it is, but when coming up to protracted breaks and the like I've found trying to create a solid schedule of rest and activity helps. Forcing yourself to not sleep until a very specific time if you couldn't (for a variety of reason, work, study, etc) sleep the night before.
If you manage to get into that schedule of actually getting decent sleep at a specific time at regular intervals, try not to break it for anything.
Secondly you might want to look at the reasons for your insomnia, maybe talk to your doctor and discuss treatment strategies or perhaps counselling if it is manifesting worrying signs of anxiety or depressive disorders. Sleep is incredibly important for both physical and mental wellbeing. It's a cornerstone of psychological fortitude in terms of dealing with stress, general happiness, critical in longterm memory store, emotional regulation and (thus) healthy/positive social engagement such as working with others and getting ontop of your studies/workloads.
If you're getting into a vicious cycle where your lack of sleep is beginning to affect social functioning, which is causing you serious anxiety and possible depressive disorders, then counsellors and talking to your doctor for short term solutions to getting necessary sleep may be the best way to address problems before there is longterm impairment that will actively prevent you further from healthy rest.