Hi Ellie, I experienced the same thing sometimes. In fact, there was once I slept for almost 40 hours. But for me, I hate to rely on meds because I can't cope with the aftereffect of it. Usually if I can't sleep until dawn, then I won't sleep at all or else my sleeping pattern will change entirely for few weeks. I'll have to wait until the whole day finished and give it another try. Our body will get exhausted eventually. I don't know if my method will work on you, but I hope you'll give it a try. And please, don't rely too much on sleeping meds, okay.