I'm twelve hours late but!! Bruce being apprehensive about nightmares leading to Hulk taking over totally fits with my headcanon about him subsisting almost entirely on naps. His circadian rhythm is a JOKE he's just up when he's up and he typically catches an average of 4-5 hours of nap dispersed in a 24-hour period. Only time he really genuinely sleeps is after a transformation, when his metabolism is fucky and trying to bounce back and he's practically comatose for like, 10-36 hours depending.
I’M ANSWERING THIS PUBLICLY BECAUSE IT’S A GOD-TIER HEADCANON.
See also: Bruce sleeps in An Actual Bed like, 5-10% of the time. Usually he just passes out wherever he is (the hulkfam/the avengers have found him conked out in broom closets, on top of shelves, in the middle of the lab floor, etc) - or, if he’s on the run, in a dumpster/tree/sewer/abandoned building/cave/etc.
The team refers to his long sleeps as Bruce Banner Hibernation Times and put up a “Do not disturb! I Am Sleeping.” sign next to wherever he’s decided to curl up. And a big blanket obviously.