Dangerous title

DS#2 is due in 2 weeks, via RCS. DS#1 has never spent the night away from home - never really had a need/desire to have him away for the night. DH has been planning on staying at the hospital with me after #2 is born. We had been planning on having my ILs keep him from the night before delivery to the day after we get home (Sun evening - Thurs morning).
However, my MIL suggested today that it might be too much upheaval for him, especially since he's never stayed away at night, and he's going to have a lot of other adjustment. She suggested they keep him during the day, and have DH come home at night so that he gets some time at home with his normal routine. I know it's not hesitation or reluctance to keep him (they're chomping at the bit, quite honestly), but real concern for DS#1 that is causing her to bring this up. I appreciate her point of view in this.
I had been a little uneasy with him being away for so long the first time, especially since it'll be due to the new little brother arriving, and I cannot really prepare him for that.
So, what says J12? Am I being overly worried about DS#1, and should send him off to the ILs for the 4 nights? Or should I send DH home in the evenings so he has that special time with DS#1 (and also gets some sleep)? Or is there a middle ground I'm missing?
Re: Opinions, please!
@Thepinksuperhero had a great suggestion! Also, I know I would want MH in the hospital with me, especially after a c/s! It would not be an option for me to be by myself. I was so loopy that first night on pain meds that MH was the one caring for the baby!
I think he will be fine overnight. Kids are so resilient and adapt really quickly! Maybe send him overnight there before the birth to see how he does and (hopefully) ease your mind? It's good for him to get used to things like staying the night away from home, or at home with other people anyway.
So my opinion (you asked for it!) is to definitely have your H stay at the hospital overnight with you and have your IL's stay at your home with DS (if possible). If not possible, let him stay with them at their home. He will be fine
And, FTR, K spent 4 nights at my parent's when he was 8 months old and 3 nights at our house with my IL's watching him when he was 15 months old. Both times he did wonderfully despite my nerves!
And in July, he will be spending 4 nights at the beach (a new place) with my parents AND my IL's while MH and I vacay elsewhere. I'm a bit nervous, but I know he will be fine