I'm unable to stargaze in one of my houses anymore, I could one day but when I played next without adding any mods or anything I can no longer select that option & one of my sims is for ever wanting to do this.. I can do this in all the other houses... or is there a way to stop sims from keep wanting this want...

The best way to deal with this is to find out why the sim cannot stargaze, rather than remove the wants. Do you have enough level room on the ground outside the house?

Yes as I said before I was able to do it one day but when I played it the next day the option won't come up...

Try resetting the sim by deleting him (or forcing an error if you play in debug mode). Are you talking about stargazing through the telescope, or stargazing by lying on the ground (I always forget the exact terms they use in game!).

On the ground. it's all the sims on that lot it won't show up for. But it does for all my other houses... When the people in this house go to another house they can stargaze but when they go back home it disappears... Should I move them out then back them in to see if that helps...

Something I'd test before you do that is to raze an area (i.e., clear an area of land about 10 squares by 10 squares and flatten it with the terrain levelling tool). See if the sim can stargaze on that. I'm just wondering if you have some stuck kicky bags or other invisible objects 'blocking' your stargazing area. Clearing an area should test this- you can always exit the lot without saving to get it back to normal, this is just to test.

Ok I'll try that & report back what happens