OK, so I promised my son (18) that I would take him to CO next year. He and his buds are so used to night skiing that they don't even get up until noon, then they're out on and off till 9:00.
Save yourself some money and buy him a Wii. A somewhat facetious comment, but only somewhat.
How about tell him if he wants the trip out West, he'll have to be on the slopes by 10AM? Something to consider. Some ground rules never hurt, especially if you are paying. If you want some father-son bonding event accommodating vampire hours, why not do a local weekend trip?
(I can relate, because my nephew has similar issues, though he is a bit younger.)
You definitely won't be getting your money's worth on a destination ski trip if you are mostly skiing late afternoon/evening. But if that is your choice, consider:
Snow King(?), Jackson WY
Keystone, CO (as mentioned)
Bolton Valley, VT (as mentioned)
Does anyone know if Winter Park, CO has night skiing?