without sleep; unable to sleep, marked by a lack of sleep or rest

Formal and Informal Expressions of sleepless

In different contexts, you can replace 'sleepless' with suitable alternatives. In a more formal setting, 'wakeful, insomniac' is apt. In informal speech or writing, 'tired, exhausted' is a commonplace synonym.

sleepless: Explore its Definition & Usage

sleepless Definition

1without sleep; unable to sleep
2marked by a lack of sleep or rest

Using sleepless: Examples

Take a moment to familiarize yourself with how "sleepless" can be used in various situations through the following examples!

Example
She spent a sleepless night worrying about her exam.
Example
The baby's crying kept me sleepless all night.
Example
He looked haggard and sleepless after working for three days straight.

sleepless Synonyms and Antonyms

Synonyms for sleepless

Antonyms for sleepless

Phrases with sleepless

sleepless nights
a period of time when someone is unable to sleep, usually because they are worried or anxious about something
Example
I had sleepless nights worrying about my job interview.
sleepless city
a city that never sleeps, meaning it is always active and busy
Example
New York City is known as the sleepless city because it is always bustling with activity.
sleepless in Seattle
a phrase used to describe someone who is unable to sleep due to emotional distress or anxiety, made popular by the movie 'Sleepless in Seattle'
Example
After her breakup, she was sleepless in Seattle for weeks.

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Summary: sleepless in Brief

The term 'sleepless' [ˈsliːpləs] refers to being unable to sleep or marked by a lack of sleep or rest. It can be caused by worry, anxiety, or other factors, as in 'She spent a sleepless night worrying about her exam.' 'Sleepless' also extends into phrases like 'sleepless nights,' and 'sleepless city,' denoting a place that never sleeps.