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Well, I can't simplify more than the title.

This question came from KorvinStarmast's answer and is related to Viishnahn's question. The sleep spell states

This spell sends creatures into a magical slumber. Roll 5d8; the total is how many hit points of creatures this spell can affect. Creatures within 20 feet of a point you choose within range are affected in ascending order of their current hit points (ignoring unconscious creatures).

Starting with the creature that has the lowest current hit points, each creature affected by this spell falls unconscious until the spell ends, the sleeper takes damage, or someone uses an action to shake or slap the sleeper awake. Subtract each creature's hit points from the total before moving on to the creature with the next lowest hit points. A creature's hit points must be equal to or less than the remaining total for that creature to be affected.

And the Bugbear Chief (from the Monster Manual) has a feature that states:

Heart of Hruggek. The bugbear has advantage on saving throws against being charmed, frightened, paralyzed, poisoned, stunned, or put to sleep.

The thing is: the only sleep inducing effect I am aware of is the sleep spell, which does not require any saving throw. So, this last part of the Bugbear Chief seems useless, since the only effect inducing sleep won't be affected by his advantage at all.

Sure, it could be there preemptively for future content or even in case someone homebrews such effects, but, other than that, are there any other (official/published) sleep-inducing effects other than the sleep spell? In particular, any that does require a saving throw? These could be poisons, monster or class features, magic items, or other spells that I'm not aware of.

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Unconscious

A filtered search of spells and items that include the unconscious condition on Dndbeyond.com yields only two results.

Sleep effects give you the unconscious condition and include language that involves sleepiness. There are at least two spells besides Sleep that do this:

Eyebite has the Asleep effect that can be imposed on a failed Wisdom save:

Asleep. The target falls unconscious. It wakes up if it takes any damage or if another creature uses its action to shake the sleeper awake.

And symbol has the Sleep effect:

Sleep. Each target must make a Wisdom saving throw and falls unconscious for 10 minutes on a failed save. A creature awakens if it takes damage or if someone uses an action to shake or slap it awake.

Both of these spells require saving throws.

For Monsters that can put a creature to sleep, please see PixelMaster's answer

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    \$\begingroup\$ Nice call. I'd actually forgot that "Sleep" is not a condition, rather it's the sum of "Unconscious" and something indicating "awake". \$\endgroup\$ – HellSaint Jun 7 '18 at 2:53
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    \$\begingroup\$ Could you slap someone around with a large trout to wake them up? Would justify dragging a large trout around on adventures. \$\endgroup\$ – Tschallacka Jun 7 '18 at 11:24
  • \$\begingroup\$ @Tschallacka You'd have to hit them pretty hard to deal damage. \$\endgroup\$ – Axoren Jun 8 '18 at 3:18
  • \$\begingroup\$ But you're saying "it's possible" right? \$\endgroup\$ – Tschallacka Jun 8 '18 at 7:50
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NautArch mentioned the spells Eyebite and Symbol in his answer.

However, there are also a few monster features that can put others to sleep; namely the following:

MM:

VGtM:

All of these abilities allow the target to make a saving throw.

Additionally, the DMG lists effects for random traps on page 297; one of these effects is the following (emphasis mine):

Vent releases gas: blinding, acidic, obscuring, paralyzing, poisonous, or sleep-inducing


Honorable mention: several creatures have abilities that render the target unconscious, but they mention awakening from this state. This could hint towards that unconsciousness being sleep, but it's not explicitly mentioned.

Hence, it's up to the DM to decide whether the following abilities count as sleep:

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    \$\begingroup\$ Not sure why I got a downvote. If however downvoted could elaborate, it would give me a chance to improve my answer ...? \$\endgroup\$ – PixelMaster Jun 7 '18 at 14:08
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    \$\begingroup\$ Would you include the Drow Elite Warrior's and Pseudodragon poison(it puts you to sleep)? \$\endgroup\$ – NautArch Jun 7 '18 at 15:31
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    \$\begingroup\$ Also - thank you for adding the Monsters. I responded to the Title question and missed the bit at the body end including Monsters. \$\endgroup\$ – NautArch Jun 7 '18 at 15:32
  • \$\begingroup\$ @PixelMaster You might have been downvoted due to my discrepancy between title and body question. "OP is asking for item or spells, not monster features, u nub". My bad if that's the case. I have now edited the title question, but it might be too late for your 2 rep :( \$\endgroup\$ – HellSaint Jun 7 '18 at 18:40
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    \$\begingroup\$ @GaelL The Chasme's drone knocks you unconscious, but there is no language in it that refers to sleep or being woken up - only that holy water splash or being attack will end it (that's why I didn't include it in my earlier list to pixelmaster.) \$\endgroup\$ – NautArch Jun 7 '18 at 20:12

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