1. You can get padlocks & even handcuffs with timers on them, some of them are pretty heavy duty, if you don't want to make a trip to the hardware store you can order delivery online.

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Combined with a strong cellar door (or a heavy duty steel security door if you must) & there really shouldn't be a problem. Just be sure you put all the tools out of the room before locking yourself in.

None of that stuff is particularly expensive & is all pretty easy to get hold of.

2. The other really obvious precaution is to have **really** big pig-out the day before the night of the full moon, when I say 'big' I mean unreasonably humongous, that's stomach stretching "I'm in no condition to do anything but lie here & be very still in case I hurt myself" huge.

You've said they're psychologically like ordinary wolves during this time & wolves don't hunt when they're stuffed.

3. Drugs, off the shelf sleeping pills & whatever else they can get hold of so they sleep through the full moon, a helpful doctor friend (or relative) might be good but so much of this can just be bought online & delivered by post that it really isn't isn't necessary.

A practical knowledge of wild herbs can also stand in for this.

4. And finally something topical, "social distancing", go camping.

Make sure you're over a day's journey on foot from the nearest people before the full moon & that you've no other means of transport to hand.

*Of course you can combine all four of these with a good solid concrete bunker somewhere in the wilderness miles from anywhere.*

> **Edit : A timed lock for the medieval era.**
>
> *You might not think timed locks are very likely or easy to come by in a medieval setting.* 
>
> *But, then again, perhaps not.*
>
> First find yourself a cave.
>
> Then you need a big rock (too heavy to move unaided & big enough to block the cave).
>
> Now you'll need some rope some wooden pit props a source of water & something to sling your rope over, this all needs to be outside the cave.
>
> Sling the rope over your 'something to sling a rope over' & tie the rock to one end & the bucket to the other such that your bucket is hanging in the air over your head, fill the bucket with water so that you can now lift & move the rock, place it over the cave entrance & wedge the pit props under it to keep it there when you empty the bucket, you know have to arrange for water from a nearby water source to drip into the bucket (you're going to need some piping).
>
> Enter the cave kick out the props (or tie ropes to them & pull them away) & the rock slams down locking you in until the bucket has filled enough to let you move the rock.
>
> Some experimentation with bucket size, drip speed & what have you may be required to get the desired timing
>
> *After the tragic early cave opening & subsequent village slaughter the first time it rains they'll realise of course that they have to cover the bucket so only the intended drips get in.*
>
> Voila! & there you have it, one crude water clock locking mechanism.
>
> *If your werewolves have access to craftsmen or else have the necessary skills themselves the same principles can be applied to something a bit more sophisticated in a normal cellar or they might use a clockwork timer & locking mechanism you set on the outside of the door.*

  [1]: https://i.sstatic.net/xQ3y4.png
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  [3]: https://i.sstatic.net/gu8BU.png
  [4]: https://i.sstatic.net/8qBGY.png