That's what I do. It's always funny to me how a lot of people want to jump from drinking tons of coffee to no coffee. There's a happy medium in-between. I drink a lot of coffee but I do ramp down my caffeine over the course of a day. Start with full caff, then down to half in the afternoon, finally to decaf in the evening though sometimes I just skip it entirely. I feel very alert consistently throughout the day except for a short period in the afternoon before I've had some half-caff. I'm asleep within about 5 minutes of my head hitting the pillow.