I DON'T HAVE WIFI IN MY BEDROOM AND I REALLY WANT IT!!?

Ok, so I don't have wifi in my bedroom, and I REALLY REALLY WANT IT SO BAD!!! The actual wifi/internet box is downstairs. But of course I wouldn't be allowed to bring it up or anything, because it's all attatched everywhere. WHAT DO I DO! I would really like to be able to have wifi in my bedroom! Thing is, I have my own study, and that has full internet connection, but I would like to have it in my bedroom so I can talk to people even after I have to go to bed :( Thing is I told my Dad that it's sad that I don't have wifi in my bedroom and he said it's probably for the best because I would be up all night on it and not get any sleep.

But I REALLY want wifi! I can't get a portable stick or something, because you have to pay for the internet you use and I have to re-top it or whatever.

Also, I can't use the mobile network on my phone because I get next to nothing credit a year and it would waste all my credit :(

Basically, is there any sort of cheat way to make the wifi extend longer?