I have seen the same with several sick relatives. They rallied, were in good spirits, were lucid - and then passed quickly after that.
My father, who was in hospice, saw “lovely women and men in white gowns singing outside the window.” He clearly saw everything we saw from the same window - the trees, a playground, a certain model of car he liked in the parking lot - but with those added visitors.
I knew then he didn’t have long, and sure enough, he was gone 36 hours later
I will chime in with second hand observations about seeing “angels” in hospital rooms, Jesus sitting in the chair besides the bed, and dead relatives being ‘with’ us in hospital rooms.
I have also heard two accounts of men cursing God up to their dying breaths and visitors in the hospital room seeing absolute terror in their eyes as life went out of them.