The Astral Sleep is the second studio album from Tiamat. It marks their debut on longtime label, Century Media Records. This album was reissued in 2006 with two tracks from A Winter Shadow single, released in 1990.
Musically, this album blends the death metal style of Tiamat's debut album with gothic metal elements. Lyrically, this album features a mixture of Satanism with introspective and esoteric themes.