Slatted roller blinds for windows - do they darken well?

But: never in bedrooms!

There is wind at night too :-)
The rest you can imagine.

No, please tell me...

Well, with strong wind the venetian blinds just go up. Not very pleasant in the bedroom hallway. We also chose roller shutters for the bedrooms. However, for monetary reasons and because they simply allow better blackout.

Nope, just tell me please...

Everyone is responsible for their own mind cinema :-)

Well, it's clear that they go up in the wind, but why this should generally be a problem in the bedroom is not. At least here with us it is usually dark at night, and the bedroom is located on the upper floor and not visible. Of course, if someone needs it pitch dark even at night when sleeping or in the morning, that can become a problem. I understand that, of course. Personally, I find it rather pleasant to wake up at least in the morning with gentle sun on my face instead of in a cave. But that is certainly a matter of taste.

Everyone is responsible for their own imagination [emoji4]

Ok, if you of course ALWAYS necessarily need a dark bedroom for THAT, then the question of blinds/shutters is probably the smaller problem [emoji12]

Ok, if you naturally ALWAYS need a dark bedroom FOR THAT, the Venetian blind/roller shutter question is probably the smaller problem [emoji12]

I don't want to make the neighbors jealous ;-) when the blinds go up and people can see inside....