
der Albtraum
nightmare
A very bad, frightening dream from which you often wake up.
Ich hatte letzte Nacht einen furchtbaren Albtraum von Spinnen.
I had a terrible nightmare about spiders last night.
nightmare
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nightmare
A very bad, frightening dream from which you often wake up.
Ich hatte letzte Nacht einen furchtbaren Albtraum von Spinnen.
I had a terrible nightmare about spiders last night.

nightmare
A very bad, terrible, or unpleasant experience or situation while awake.
Die stundenlange Zugfahrt ohne Klimaanlage war ein absoluter Albtraum.
The hours-long train journey without air conditioning was an absolute nightmare.
The word is made up of 'Alb' and 'Traum'. An 'Alb' is, in old legends, an evil spirit or demon that sits on the chest of sleeping people at night and causes fear. So an 'Albtraum' (nightmare) is literally the 'dream caused by an Alb'.
Früher glaubten die Menschen, dass böse Geister Albträume bringen.
In the past, people believed that evil spirits brought nightmares.
When referring to a bad dream, the word is often used with certain verbs. Typical combinations are 'einen Albtraum haben' (to have a nightmare) or 'aus einem Albtraum aufwachen' (to wake up from a nightmare).
Ich bin schweißgebadet aus einem schlimmen Albtraum aufgewacht.
I woke up drenched in sweat from a terrible nightmare.
In the figurative meaning for a terrible experience, 'Albtraum' (nightmare) is often intensified with adjectives like 'absolut' (absolute), 'rein' (pure), or 'wahr' (true). A situation can also 'zum Albtraum werden' (turn into a nightmare).
Die Renovierung unseres Hauses wurde zum reinsten Albtraum.
The renovation of our house turned into a complete nightmare.
horror
„Horror“ and „Albtraum“ can both describe an extremely terrible experience. „Horror“ emphasizes how terrible and distressing it is; „Albtraum“ presents it figuratively as an almost unbearable experience. In figurative use, the words therefore often overlap.

Die stundenlange Fahrt im überfüllten Zug war ein Albtraum.
The hours-long journey on the overcrowded train was a nightmare.
Die stundenlange Fahrt im überfüllten Zug war der Horror.
The hours-long journey on the overcrowded train was pure horror.