hypnagogic

/hษชpnษ™หˆษกษ’dส’ษชk/
adjective
  1. 1

    That induces sleep; soporific, somniferous.

  2. 2

    That accompanies falling asleep; especially, pertaining to the semi-conscious period immediately preceding sleep.

Antonyms

Source: https://en.wiktionary.org/wiki/hypnagogic