While we’re considering stuff: if you have persistent seasonal allergies, consider a steroid nasal spray rather than antihistamine pills. Different profile of side effects, and often more effective.
I was actually taking allergy pills because they help with my asthma symptoms, and nasal sprays don’t seem to help me. I started taking Singulair / Montelukast about halfway through when I was taking Zyrtec every day, and it seems to be more effective without the sleep-related issues (although the combination was still more effective for my asthma than either alone).
But yeah, for normal allergy symptoms, focusing the medicine on your nose instead of your entire blood stream is also a good idea. Theoretically there’s even an antihistamine nose spray now (Astepro) although I haven’t tried it.