What starts with T, ends with T and has T in it?

What disappears as soon as you say it's name?

Where can you finish a book without finishing a sentence?

I arrive when the school day ends, like a gift wrapped in dread, I take over your night while you’d rather be in bed. I multiply when ignored, like socks in the wash, and no, your dog didn’t eat me, don’t be that posh.

I come before sea, hook, and herring, But after see, code and go. And right in the middle of boom, but not if you’re having fun with this riddle!