"To remain current you do 3 full stop landings every 90 days. Sounds like the rules are a little more lax in the U.S. vs. Europe."
For keeping the rating current, EASA is more lenient than the FAA.
For EASA you need 3 full stop landings, ONE of them must be at night.
FCL.060(b)(2)(i)
Or NONE at all if holding an IR rating: FCL.060(b)(2)(ii)
FAA: ALL of the three take-off and landings must be at night, and no credit for IR.
And to be even more clear: That only applies for carrying passengers.
Flying solo at night has NO currency requirements (FAA or EASA).