[Guinness]

Sleep? BAH.... it's not sleep..... u are merely "resting" to recover spells. I am sure while the wimpy spell casters are busy mugging their spells, the big hard barbarians are still keeping watch.

Anyway..... So far my fav tactiXs:
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Web, entangle

Spiked stone, cloudkill/acid fog

then pelt the enemy to bits while they try coming towards you.
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Block a doorway (either with a "sphered" character or a one protected against fire!)

let the entire army of enemies come to attack

Let loose a "shroud of flame".

(this works esp well in the underdark.)
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Variation of above can be augmented other spells and stuff.....