寝ねしな

noun

just before going to bed; just as one gets into bed

Often used with the particle に (寝しなに) to describe an action taken right before sleep.

• 寝ねしなにスマホを見みると、目めが冴さえてしまう。

  If you look at your smartphone just before bed, you'll become wide awake.

• 寝ねしなに一いっ杯ぱいの水みずを飲のむのが習しゅう慣かんだ。

  I have a habit of drinking a glass of water just before going to bed.