From Pluralpedia, the collaborative plurality dictionary
sleeper (n.)
Other formsnap alter
Applies toheadmates

A sleeper is a headmate whose main role is to make the body sleep. They may be overall sleepy and tired most of the time as a result. They could have formed because the body was sleep deprived, or they can come with a disorder generalized with sleepiness[1][2], but neither of those are requirements. Distinct from a drowser because their role is to sleep, not lull others to sleep.

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