Dreams, yes!!! In one other mud, your character saw dreams when he was sleeping. That was rather entertaining.
Maybe give psi-classes/races (psi, illithid, demon) a skill so that they can watch dreams of sleeping person.
sl
You go to sleep.
In your dreams you see a absolutely huge dragon flying on the skies and torching the villages. You go to fight the dragon, and beat the Bryntryst out of it!
In your dreams you fight against a horde of undeads that keep pouring under the ground. Fight is intesive, but you seem to be victorious.
You feel as if a needle would be struck on your brain.
In your dreams you are imprisoned by an huge trolls that are about to cook you as their dinner. There is absolutely nothing you can do, and you feel utterly helpless.
wa
You wake and stand up.
l
A Psi is here, grinning.
An Illithid is here, snickering.
An Illithird shows you his proficiency with cause nightmares: 95%
a
You are affected by:
Spell: Nightmares for 1h
And if you think about PK use for the skill, it could slightly reduce mana/hp/mv-point gain while affected is sleeping.
Then you could create special item for thieves that casts cause nightmare on (successful?) jack, or special gloves for ninjas.
Against ogre/mage it would be super. 