sleep tight means: Sleep well, and you will be able to sleep soundly. Here’s a cute message of good night. (in Slang Dictionary, added by Brassage)

What else does sleep tight mean?

  • It means Sleep well. This is a very common phrase used in English. This phrase has been used at bedtime since many years. It can be spelled “good night, rest tight, don’t let bedbugs ****”, or some other similar expression. (in Slang Dictionary, added by Lourdes Márquez)
  • The term “Sleep Tight Pupper” refers to Gabe, Gabe’s dog, or any other popular meme about dogs. It is usually a sign that the pupper has died. (in Slang Dictionary, added by Antonia Suárez)