Maybe you need to ride more. I usually ride at least 15 miles/day, and I have way more energy all the time than when I started. I don't even use an alarm to wake up anymore. Maybe it varies per person, but since I started cycling, I feel awake and alert when I wake up, and feel energetic and focussed throughout the day. I go to bed at the same time every night +/- 30 minutes and rarely have any trouble falling asleep.

The exception to this is if I ride within an hour or two of bedtime.

Edit: When I started cycling, I cut soda out of my diet, which accounted for 95% of my caffiene intake too.