when i extended toms A time he use to get grizzly because i was giving him too much stimulation in a time. he tended to be grizzly the last half hr of A time so i put him in a baby carrier thingy and walked around the house doing washing up etc. this helped, and he now does 2hrs 30 A time or even 3 hrs without getting grizzly, so im now in a position i can put him to bed BEFORE hes over tired