Used to go to bed between 12:00am and about 3:00am, however since I now get up for work at 6:30am it's exceedingly difficult to stay up late even when I want to

Used to go to bed between 12:00am and about 3:00am, however since I now get up for work at 6:30am it's exceedingly difficult to stay up late even when I want to. However, I still routinely stay up past 12:00am but generally hit 11:30pm