Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Adjective: sleepless  sleep-lus
  1. Experiencing or accompanied by sleeplessness
    "lay sleepless all night";
    - insomniac, watchful
  2. Always watchful
    "to an eye like mine, a sleepless watcher of the public weal";
    - lidless

See also: alert, awake, watchful

Encyclopedia: Sleepless