Nintendo is said to be blocking access to adult-rated eShop content at certain times of day.
A Nintendo of Italy customer support representative is said to have told a NeoGAF user via email:
"Dear customer, we would like to let you know that Nintendo has always aimed to offer gameplay experiences suited to all age groups, observing carefully all the relevant regulations regarding content access that are present in the various European countries.
"We have thus decided to restrict the access to content which is unsuitable to minors (PEGI) to the 11pm - 3am time window."
We've contacted Nintendo about the report and are awaiting an official comment on the matter, which is expected to be released shortly.