Sleeping? From 26 June to 2 July we will be above the Artic Circle only a week after the Summer Solstice. We'll see the sun rise the morning of the 26th and the next time we'll see it set will be the evening of the 2nd. Watch the movie "Insomnia" to get the idea. Preferably the Norwegian original (on Criterion DVD with English subtitles) set in Tromso rather than the Robin Williams remake set in Alaska (save that version for your next Alaska cruise). Fortunately, the cabin window curtains are nice and opaque!

Might also be time to reread Bear Island by Alistair MacLean.