[fmavituna]

From personal experience this is not isolated to gaming. As a gamer and coder whenever I spend 2+ hours just before sleep on gaming, heavy coding, research I tend to get a bad sleep. I guess during coding / research it's because my mind stuck with certain problems (hence eureka moments in the morning). Also I look forward to the next morning so I can try out all these new ideas (which always causes me to wake earlier).

Right after gaming or a mind stimulating movie (i.e. Fight Club) again my mind is too busy with the stuff so sleep quality is worse than general.

For the last 4-5 years I consciously try to put a buffer between all these active engagements and my sleep by watching a sitcom or just doing light reading in between.