Carl's Fallout 4 Guide
for PC, Xbox One, and PS4

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Fallout 4: Mister Sandman

Mechanics & Powerful Crits in Combo with Ninja

Mister Sandman stacking with the Ninja Perk results in huge damage Mister Sandman stacks with the Ninja Perk to give you massive damage boosts on sneak attacks.

Mister Sandman is easily one of the better Perks for a sneaky build in Fallout 4, though its primary mechanic only works for ranged characters as you cannot put suppressors on melee weapons. My initial impression was based on bad math and that you won't catch many enemies sleeping in the game - the increased sneak attack damage is the main draw here. Here are the three ranks of Mister Sandman and the level requirements/Perk ID:

Mister Sandman Perk
RankRequiresPerk DescriptionPerk ID
1Agility 4As an agent of death, you can instantly kill a sleeping person. Your silenced weapons do an additional 15% sneak attack damage.4b258
2Level 17Your silenced weapons do an additional 30% sneak attack damage.1d2490
3Level 30Your silenced weapons now do 50% more sneak attack damage.1d2491

Mister Sandman PerkGameplay Effects & Utility
The sleeping bonus is good and all, but it's rare to catch raiders sleeping, so it's really a side attraction. Mister Sandman stacks additively with the Ninja Perk, which changes the base sneak attack multiplier from 2 to 2.5x, 3x, and 3.5x for ranged weapons. This is great in itself as it doesn't require a suppressor to be on the weapon, but with Mister Sandman you'll definitely want at least one silenced weapon - usually a rifle or pistol.

Taking Ninja first is wise, because it does not require a silencer and Mister Sandman gives smaller increases to damage per level. Ninja 1 will give you 2.5x, while Mister Sandman 1 will give you 2.15x damage.

At one point, this Perk stacked multiplicatively, but now it does not matter the order you take these Perks. You can go Ninja > Mister Sandman and gradually increase your damage until you're eligible for Rank 3 Ninja at level 33. What still matters as of patch 1.4 is Deacon's Cloak and Dagger Perk will still stack multiplicatively with these, so it's best to get all 3 ranks in Ninja and Mister Sandman before reaching max affinity with him. In doing so, you can reach 4.8x damage.

As for melee users not getting this bonus, they don't really need it. Ninja gives a 10x boost so their damage output is amplified a lot already, based on their need to get quite close (without Blitz) in order to execute a melee sneak attack.

Mister Sandman is highly recommended in a Sniper Build where it can truly shine, as nearly any ballistic sniper rifle can have a suppressor attached. Even Gauss Rifles, which can be boosted well into the 400s in terms of paper damage.

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