Yesterday was summer solstice which, below the Arctic Circle, is the longest day of the year. Here, we're in the middle of a four-month long day, so let's just call it "noon". We celebrated by leaving the window-shades off all night long, so that we could feel the full effect of the bright, bright midnight sun.
It's a transition period in many ways. Although there are still patches and occasional deep drifts of snow, there is now more brown than white in the landscape, and starting Monday, we're taking ATVs rather than snowmobiles to our sites. Our science is changing, too, from projects that were focussed on the snow and the permafrost to those that are interested in the now-uncovered rocks and the crater itself.
We're also embarking on a unique experiment: Mars time. The Martian day (or 'sol') is about 40 minutes longer than an Earth day. For the month of July, we'll be working on Mars time, so will gradually drift out of synch with all you Earthlings. Each sol, we will take several cognitive tests and keep a sleep diary, so that any physiological or psychological disruption can be detected. Because we have fairly constant daylight (clouds passing over the sun cause more light variation than the time of day), we don't have any natural cues to tell us what time it is, so any discombobulation we feel will be due to the shift itself. I expect we will feel better, if anything, thanks to the 'extra' 40 minutes in our daily schedule, but it's an important question to answer before we send astronauts to Mars to cope with it for real.
Here's the view from the hab at 10pm on the night of June 21st: