Restless

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Old English restlēas (see rest1, -less).

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From Middle English restles, restelees, from Old English restlēas(“restless; disturbed”), equivalent to rest +‎ -less.

etymonline

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restless (adj.)

late 14c., restles, "finding no rest or sleep, unable to rest; uneasy in mind or spirit," from rest (n.1) + -less. A general Germanic compound (Frisian restleas, Dutch rusteloos, German rastlos, Danish rastlös). The meaning "stirring constantly, desirous of action" is attested from late 15c. Related: Restlessly; restlessness. Old English had restleas "deprived of sleep."