I experience this on almost a daily basis. When I go to sleep my heart starts to race and my brain goes haywire: all the anxieties suppressed by daylight resurface, I think of what if s and should have s, start making up scarily lifelike worst case scenarios. Then of course the following day I'd be harried and useless, oversleeping a class and worsening the situation. I'm not sure what I lack... discipline? maturity? mental strength? sanity? Plus, yeah, I'm "lucky" and "a bright future awaits" of course, without doubt, right.