I don't know if you're into Cryptic/English crosswords at all - or whether either of the NYT crosswords would qualify as such. Most Americans don't even seem to know they exist. I've been addicted for over 30 years, after picking up a book of them in an airport and being a captive audience on a plane for about 6 hours. Anyway, if you're "down with the cryptics" (I just coined the phrase LOL), don't walk; run out and buy this book:...both crosswords...
You just have to consume in moderation LOL. I worked on that book for a couple of years. It was actually a bummer finishing it, because I can't find another book half as good to keep me company.Looks really cool but these days I like my brain exercises in little bite size bits.