Install the blinds before adding anything else to your window like curtains.
Block light around door.
I have them on the windows in my bedroom it can be bright and sunny outside and completely dark in my bedroom because of them.
If you are seeing light through exterior doors you may need to simply replace the worn weather stripping.
Check out how to make your own french inspired boxy door draft or light blocker.
Visit your local home goods store for blackout blinds which help prevent any light from entering the room.
Move it up or down until the door closes smoothly with no light seeping through.
I found that by blocking the light coming from under the door helped a lot with sleep.
Focus on blocking light and sound first covering windows masking and absorbing noises and blocking air leaks from around windows or doors.
You can see by this photo that the foyer has a lot of light and the bedrooms are right off of it.
Install blackout blinds that are mounted to your windows.
You can also purchase room darkening curtains and just hang them over the door these curtains are made of a kind of fabric that blocks light people who work at night and sleep during the day purchase them.
Purchase blinds that are 1 2 in 1 3 cm or so smaller than the width of your window but long enough to cover the entire window.
Adjust the door threshold with a no.
Cut a new length of stripping to fit into the groove and either nail it or stick it.
Blackout curtains or shades.
With heating costs going through the roof here s an easy way to keep heat from slipping out your doors too.
Take 30 minutes and replace the weather stripping and door sweeps around your steel entry doors.