How to deal with wife who keeps us awake?

My 2 year old son and I sleep in a different bedroom to her because she likes to sleep at 3 or 4am and get up at midday.

I'm trying to change my sleep schedule to get my son to daycare earlier and be more productive!

In the past our son would be sleeping at midnight with her and father in law. Father in law left for China and she moved into the spare room. Used to be a case of sleeping in the early hours of the morning and waking at 10am to drop him to daycare at 11am. Effectively leaving me with only 5 hours toddler free time to get things done.

My parents and I have been so upset with this arrangement. It is unfair for my son. So I vowed to start the week with getting up at 7am. But my lovely wife had to get up and wake us up at 2am after only 1.5 hours sleep. I can't sleep now. I got annoyed at her and she started getting aggressive trying to pull off my blanket and keeping us awake. Hopeless. Short of putting a deadlock latch on the bedroom door, what else can I do to stop her?

I don't think I can sustain days and days of only 4 hours sleep. I can't finish cleaning up the home or preparing other tasks. My life is a mess of disorganisation because there's not enough free hours to get things done! That can change if she leaves us alone and I start my day nice and early. Then I'll have more time in the evenings when my son sleeps earlier!! I don't understand why she doesn't get that.