The night is dark and full of terrors

Nightmares can be used as a manifestation of guilt, traumatic memories (or supressed ones), troubled visions, or even as a general form of the old and unconfortable fear.

Regardless, the whumpee then wakes covered in sweat, panting, alone or startling someone else. Tears, angst or panic attack might follow.

May or may not be related to PTSD or other tropes.

Animes
Magic Knight Rayearth


 * On season 2, Hikaru has recurrent nightmares about a mysterious woman and the fate of the planet.

TV Shows
A Discovery of Witches


 * 1x01: Ever since she found the mysterious manuscript at the library, Diana Bishop (Teresa Palmer) starts getting nightmares involving spiders.

Andromeda


 * 1x14: Seamus Harper (Gordon Michael Woolvett) was "infected" during an attack, and now is suffering with information overload. He is always doing something, seeing something, exhausted, and when he tries to sleep, it's only to be flooded with visions and he wakes up screaming.

Arrow


 * 1x01: Oliver Queen (Stephen Amell) is dreaming about the night of the accident, and when his mom tries to wake him up, he almost attacks her. The guilty back away he does when he realises it is pretty good.

Carnival Row


 * 1x05: Rycroft Philostrate (Orlando Bloom) dreams about a baby fae having his wings cut off, and wakes up visibly shaken.

Cidade Invisível | Invisible City


 * 1x01: Eric (Marco Pigossi) has a weird dream (involving flashes of a Boto) and wakes up apparently in pain.

Dark


 * Jonas Kahnwald (Louis Hofmann) has frequent nightmares, particularly during season 1, regarding his recently dead father.

Designated Survivor


 * 1x12: At the hospital, Tom Kirkman (Kiefer Sutherland) startles his kids, waking up shaken from a double nightmare about the recent events.

Kyle XY


 * 1x06: Kyle (Matt Dallas) dreams with some images that might be clues to his past, focused on an unknown man's face, and wakes up startled.
 * 1x07: Kyle has another dream, now with more (scary) details from the night the unknown man was killed.

Magnum P.I. (2018)


 * 3x07: Thomas Magnum (Jay Hernandez) starts off with a nightmare involving his unknown stalker, and is pointed as very tired (by everyone else) for the rest of the episode.

Merlin


 * Morgana (Katie McGrath) has constant dreams and nightmares, that turn out to be visions, as a manifestation of her power. She fear these dreams, and it brings some angst to her during the first few seasons.

New Amsterdam


 * 1x20: Max Goodwin (Ryan Eggold) has a brief nightmare of a possible future where he is dead and his daughter is alone.

Once Upon a Time


 * 1x07: Graham Humbert (Jamie Dornan) wakes up shaken by a weird dream, that was actually one of his real memories as the Huntsman.

O Profeta


 * Marcos (Thiago Fragoso) has visions, sometimes in form of dreams he doesn't understands.

Salvation


 * 1x06: Liam Cole (Charlie Rowe) dreams about the events from the previous episode, his kidnapping and him killing a former friend, his last words, the blood on his hands...

The Falcon and the Winter Soldier


 * Ep 1: Bucky Barnes (Sebastian Stan) wakes up to his empty apartment, consumed by guilt, after dreaming about a memory from his days as Winter Soldier.

Virgin River


 * 1x05: Jack Sheridan (Martin Henderson) is sleeping on a chair, and he dreams of a traumatic moment at Iraq. He speaks on his sleep, agitated (Mel wakes up from it), and even when he gets up, he's still trapped in the memory.