I stayed - and glad of it. Didn't sleep much - nor did I plan on it. Every time husb. moved, I was checking on him! Throughout the night he needed a lot of water (sipping), which he couldn't do himself. Nor was he alert enough to punch the nurse's button if he had gotten into trouble during the night. They also were asking him if he wanted more pain meds and he was too groggy to respond. (I finally got a "yes" out of him.) There's just too much that can go wrong in hospitals these days and - without being a nuisance - I think the nurses appreciate having someone there. The one we had got blankets, sheets, and pillow for me. Told me where the snacks, water, and coffee were and I just made myself at home. And when they got him up to walk, there was only one nurse to do it, so I felt better being on the other side of him then, too. There's other stuff - if the catheter backs up or bladder spasms hit, etc. Then, the next morning, they were going to give him a generic of his typical blood pressure medication (even one will give him a severe headache) and I was able to stop them and give him his real one. And, then, the doctor came through about 5:30 a.m., which I certainly would have missed if I hadn't stayed.
I went back once to the hotel late afternoon to get comfier clothes on and take out my contacts. Grabbed snacks and a book and headed right back.
Husb. tried to talk me out of it at first, wanting me to get a good night's sleep - but I wouldn't have, anyway, and he was glad I was there.