Heia

Etymology
Chiefly Central German word attested since the 18th century. Related to common lullaby verses like. This is probably of mere interjectional origin, though some have ventured to derive it from, in which case it would be related with. The late attestation is only a weak counterargument in such a childish word; nevertheless the relation seems rather hypothetical.

Noun

 * 1)  bed or sleep; beddy-bye