I have got to take Zyrtec every day now... the pollen is so bad. This has a beneficial side-effect- it knocks out Rachel. At four weeks she now sleeps for 6 hours in the first half of the night, and then for another 4 hours after a feeding. (Granted, sometimes it's a very LONG feeding, but at 3 am everything seems long). So I usually take a Zyrtec in the early evening.
Unfortunately today I had to take one at around noon. And this is the result: a 4 hour nap! She will NOT WAKE UP. Grrr... I really loved the fact she was almost sleeping through the night, too. [sigh]