Step 1 (If possible)
Bend the book backwards. (Opposite of closing it).
Check if it worked. If Flip to a different page and repeat step 1.
I looked this thread up and nothing was useful. This made the stubborn Kip S. Thorne time travel book (closes extremely) just 'die'. Now my time travel book is happy.
Step 4 (if needed).
Stomp on the book. (Not joking, this is a very delicate stomping. The human weight would probably win the fight.).
Buying Kip Throne's book was very difficult because of this battle.
I won in a few seconds.
Now I can finally read it after these months. Luckily that book I have responds well to these methods. I didn't have to stomp this time. Some notebooks don't play nice. Stomping on the middle-thing fixes that. Now I can read it no matter how sleepy I am.
Should've done this a month ago.