sleep

1. Origins, structure, and basic meaning

• Structure: 睡 has 13 strokes and concerns sleep.
• Basic usage: 睡眠 is read すいみん, and 熟睡 is read じゅくすい.

2. Common pitfalls and similar expressions

• Sleep and sound sleep
  • 十分な睡眠を取る means to get enough sleep.
  • 睡眠が浅かった means sleep was light.
  • 朝まで熟睡できた means was able to sleep soundly until morning.
  • 睡眠 refers to sleep itself, while 熟睡 emphasizes sleeping deeply and soundly.