Temporary light blocking shades

What about a pull down black out shade then you can roll it up when you want light

What about some simple lined curtains? The big box stores sell them at many different price points. Also changing the direction blinds so that they are facing up instead of down may help.

You might want to look at the exterior solar shades. We purchased ours at Costco. They retract into a cylinder holder at the top and are not noticeable when not in use.

We live in the extreme northwest and the sun streams through our windows as the seasons change and the sun gets lower to the horizon. If this option will not work for you there is a solar covering for the inside of your windows.

you would have to measure the distance between your blinds and window then check the size o the blinds they will help you at Lowes or Home Depot take your measurements with you good luck

I'm the type of person that has to have the bedroom pitch black to sleep. After many tries of various blinds, curtains and shades I found some black paper accordion style shades. I bought them at Lowe's for $5.68! I know what you're thinking. Paper? How cheap can you get? Think what you will but these work. My bedroom is so dark at night you can't see your hand in front of your face. You can lower or raise them and then clip them in place with the enclosed clips. During the day, if you want to keep your room cool, all you have to do is lower the shades and your room stays cooler and it also prevents any glare on your television. Another good point is that if you don't want your visitors to see these "cheap" shades, you just raise them all the way up to the top of window. Try them, you'll like them.

get those static cling tinted for cars , windows etc, come in small sizes

yep and Walmart I got a small one for a back auto window, they just cling by static electricy. very simpls ,follow directions or better yet go online to web search 'auto shades'.. God bless