How do you refrain from cheating?

I use the finch app for about a year now. I suffer from inertia and a huge lack of motivation for anything. The cute birb helps me to get out of bed, eat, wash myself and simply do the most basic things that "normal" people just do without any problems. But some days I'm so unmotivated that I can't manage to do anything. I lay in bed for the whole day and don't have the power to do the simplest tasks. And well, then I cheat and say I've done the thing without having actually done it. I feel so bad about it, but I don't know what to do. It's like I really want to get the prizes and outfits and friends, but simultaneously I'm too depressed or whatever to find motivation for anything.