Even though my sister said she would take care of my baby tonight, I miss him

We’re staying at my sister’s house tonight. She turned one of her guest rooms into a nursery just for Lucas snd said Desmond and I can just have a night off and she would take care of Lucas, and I trust my sister fully to do so. But I couldn’t help but miss being with him and found myself waking up in the middle of the night and unable to fall back to sleep because of it. I went downstairs to visit Lucas in the crib my sister got for him. He was sleeping, but I stayed and watched over him for a while anyway. I keep being told to enjoy the little break I have while it lasts, but I’ve just found I can’t help but feel a bit of separation anxiety whenever I’m away from Lucas. I’m back in bed now and will try sleeping again soon. But I love Lucas so much, even when I should be catching up on rest when given the opportunity, I can’t be away from him for long.