夢寐 is read as むび (mubi) and means asleep.
むび
mubi
むげん
dreams
ゆめ
dream
むちゅう
within a dream
むそう
ゆめにも
(not) in the slightest
ゆめものがたり
account of a dream
ゆめみ
having a dream
ゆめみる
to dream (of)
ゆめをむすぶ
to sleep
むちゅうゆうこうしょう
sleepwalking
ゆめみごこち
dreamy state of mind
ゆめみづき
third lunar month