Here's another episode that's fun to watch if you're a fan of the basic Star Trek format of a crew running into a situation where aliens are just messing with them (much like the earlier "Scientific Method").
Again, Chakotay finds himself in a nominal lead position, but there's very little to his part in the story other than following along as everyone falls asleep and can't wake up. There are other episodes like this, notably in Next Generation and Enterprise, but again, this is a worthy variation.
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Memory Alpha summary.