Definitely. Many of our members tell us that they read their morning email on their phones in bed, and it gives them a little boost to go out into the world and accomplish great things.
My habits with iDoneThis are a little inverted compared to this. The last thing I do each day is reply to my "what did you do today?" email (seriously the last thing - I get into bed, reply to that email, and then sleep). I find the thought of wanting to have something worth putting in that email drives me to do more throughout the day, it's a great motivational tool.
The other big advantage I have is that at the end of the week if I'm feeling like I haven't really achieved anything, I can look back through my calendar and get a nice overview of what I did - it's a good pick-me-up for the perceived-lack-of-productivity blues.
I suspect you're using the "personal" iDoneThis. With the business iDoneThis, we have the same evening email, and in the morning, we summarize yours and your team's achievements in an email digest. It hopefully has the effect that you describe of looking through your calendar, except that it shows up in your inbox on a daily basis.
The other big advantage I have is that at the end of the week if I'm feeling like I haven't really achieved anything, I can look back through my calendar and get a nice overview of what I did - it's a good pick-me-up for the perceived-lack-of-productivity blues.