I prefer to sleep on a firm bed.

我比较喜欢睡硬床。

Well, you've established a firm bed of insecurity.

嗯，你的不安全感很充分了。

When something is firm, it is solid, but not too hard. He sleeps better on a firm bed.

当某物是坚实的 它是坚实的 但不是太硬 他在结实的床上睡得更好。