forty winks

forty winks {infml} (a nap; some sleep; a short sleep during the day)

Example 1: I could use forty winks before I have to get to work.(thefreedictionary.com)
Example 2: I need forty winks before I get started again.(thefreedictionary.com)

catch / take / have forty winks (to take a nap; to get some sleep) — вздремнуть, немного поспать

Example 1: I'll just catch forty winks before getting ready for the party.

Example 2: I think I'll go to bed and take forty winks. See you in the morning.

Example 3: She just had time to put her feet up and catch forty winks before dinner. (thefreedictionary.com)

Also catch a wink

Related vocabulary:
take a nap at
[catch some zzz's]