How not to go crazy...???!

I have a 5 yr and 5 week old boys and im having second thoughts about going on maternity leave for a yr.. just 5 weeks into my mat leave and im starting to go crazy.. my 5 yr old does not go to kinder till sept so we’re both- sad to say, boored. I have no one to talk to all day except him and im doing the same thing - day in and day out.. i cant go out since its still pretty cold and i dont want to risk our little one... my husband takes the car to work so im starting to feel like a prison at home... how do you keep your sanity together for the first few weeks of having a newborn???!