noun
Refers to the act of waking from sleep, often with a nuance of the state or feeling upon waking. Commonly used in expressions like 寝覚めが悪い (waking up feeling bad/unrefreshed) or 寝覚めの悪い思い (a guilty conscience that disturbs one's sleep).
今朝は寝覚めが悪かった。
I woke up feeling unrefreshed this morning.
彼の言葉が寝覚めの悪い思いをさせた。
His words left me with a guilty conscience that kept me awake.