Heads-up and Sleepless

Heads-up adjective - Fully alert and watchful.

Sleepless and heads-up are semantically related. In some cases you can use "Sleepless" instead an adjective phrase "Heads-up".

Sleepless adjective - Not sleeping or able to sleep.

Heads-up and sleepless are semantically related. Sometimes you can use "Heads-up" instead an adjective "Sleepless".

Nearby Words: sleep, sleepy, sleeping, sleeplessness