Leave the light on otherwise the ones who haven't finished might not...
If its your first hatch, that means its his first hatch too.
TRUST ME!!! No matter how many more he sees in his life this one will be the most special (for you too) let him stay up and see those fuzzy little babies come into this world, I was 8 when my first hatch took place and now at 23 with well over a dozen hatches since then that one was still the most fun, the most memorable, and most shockingly amazing thing I've ever seen in my life (second only to having my own daughter but that one came with pain too so it was almost a tie) and I am still very grateful to my parents for letting me stay up on a school night to watch.
O POST PICS OF THE BABIES WHEN THE HATCH IS DONE!!! BYC LOVES to see babies.