Impression, nightmare, or theres some people who interpret it as a return of an astral journey. Perhaps you are containing nerves during the day and you need to shake them out.
Dream dictionary: Tremble dream meanings
…(Shake | Shiver | Tremor) Seeing one’s head trembling in a dream means gaining honor and rising in station. If one’s right hand trembles or shakes in a dream, it means difficulties in earning his livelihood. If one’s right leg trembles in a dream, it means profits from one’s family or clan. If one’s left leg trembles in a dream, it means business losses. The same applies to the trembling or the shocking of any part of one’s body. (See Body 1 | Tremor)…
(Labor pangs | Labor throes | Quake | Shaking | Shock) A tremor in a dream represents plants blooming, grass growing, vegetations sprouting, the blossoming of garden flowers, and the ripening of fruits. If a pregnant woman sees an earth tremor in her dream, it represents labor throes. (Also see Earthquake | Shock | Tremble)