ST. PETERSBURG, Russia — This is one of the world’s great cities, a magical mix of colors and canals that sparkle, especially in June, when the sun does not dip behind the Baltic Sea until around midnight. Visitors and residents wander the streets and embankments through the small hours of what is night during the rest of the year but these days is just a brief dawn.
A favorite middle-of-the-night activity is strolling to the harbor, where thousands pack the banks of the Neva River to watch the bridges rise so boats can enter. The nearly uninterrupted light this far north acts as a kind of human power plant, continuously fueling millions of bodies but preventing them from getting the signals they need to begin the daily wind down that eventually leads to sleep.