If liches don't sleep

[Yqatuba]

Do they still have to wait 8 hours to get their spells back? If so what do they do during this time? Just sit there?

[SorrySleeping]

Uninteruptied meditation. Being stirred to battle counts the same as waking up for battle, and you must meditate for an additional hour for each interruption.

[Klorox]

yeah, their mind needs rest of some sort to renew spent spell slots... and probably, just sitting there is precisely what they do, unless they have a nice tomb they like to rest in.

[Shiroi]

Or a ring or class ability that fixes that little quirk. Most liches can afford to not sleep as much.

[Klorox]

there are rings that suppress the need for rest to regain spells (and I do say rest, not sleep, since undead don't sleep anymore)?

[Mark Hoover 330]

Turn into demi-liches.

[Dave Justus]

Mostly advanced brooding.

[captain yesterday]

Tammy has hobbies.