nebukuro de neru.

I sleep in a sleeping bag.

Breakdown of nebukuro de neru.

• で: means particle
• 寝ねる: to sleep
• 寝袋ねぶくろ: a sleeping bag

Questions & Answers about nebukuro de neru.

Why is the particle で used in 寝袋で寝る?

Here, で marks the place or means in which the action happens.

So 寝袋で寝る means something like sleep in a sleeping bag.

In Japanese, で is often used for:

• the place where an action happens
  
  • 公園で遊ぶ = play in the park
• the means/tool used to do something
  
  • バスで行く = go by bus

In this sentence, 寝袋 is treated as the place/context in which you sleep, so で is natural.

Why not use に instead of で?