important questions about my kitty?

Hi, i need to ask some questions about my kitty and i hope i get some help and some answers : 1-Is it normal for my kitty to sleep 15 hours a day ? 2-When i spay her, is she going to be the same after the operation ? I mean crazy, playful and energetic, Is there any behavioral changes ? And how much time does the operation take ? How much time for my kitty to recover ? Is it painful for her ? 3-If i don't get her spayed, is she going to get cancer 100% In the future ? (because i'm not going to let her go outside and die never ever )... 4-Is there any other solution Besides the surgery ? Something with less risks ? 5-What if my kitty dies during the operation ? Thank's