Sorry for your loss.
I also am in a situation having one surviving glider, although he is around 10 years old. His slightly younger (approx 8yrs old) cage mates passed just months apart, Lulu in October of last year and then skadoosh in March.
He gets up during daytime hours, but he did before they passed as well, though now he may more frequently, mostly to snack or drink. He did begin over grooming a little after Lulu passed and when Skadoosh got ill. He still does, but eats well and is as active as always.
I do try to spend as much extra time with him as possible. Every morning, after tray cleaning and cage spot cleaning, I give him two yogurt drops. If he's up, I'll sit him on my lap while he eats them, if he's in the pouch, I hold the pouch on my lap and feed them to him. I talk to him and pet him. At dinner time, after work, I try to sit and talk with him a bit, later in the evening spend some more time. Sometimes,if he's wanting to come out, 2-3x per week, occasionally more or less, depending on whether he's ready to come out before I go to bed (which is about the same frequency as before the girls passed, sometimes one or both would come out and he wouldn't). If he doesn't want to come out, and in the pouch, I hold pouch and cuddle him with my hand in pouch for a bit. If he's out and about the cage, but doesn't want out, I just visit at the cage for a bit. I leave it up to him, but he gets more time one way or another, like it or not, lol.
I have a fleece hedgehog, I can't remember where I ordered it, but it was in the cage with my trio. I never washed it, so it had their combined scent still on it. I tuck it in the pouch with him now, so he's got something to cuddle with. I'd like to get another, if I could remember who made them. I'd like to wash one and get my scent on it, then swap them out for cleaning.