At 2 a.m., the smallest thought can take over the room. Stargazer understands that escalation on Insomniac, a debut single that compresses insomnia, anxiety and emotional isolation into 2:27 of alternative rock, emo, electronic production and hip-hop-influenced delivery. It moves with the pace of someone trying to outthink their own fear, then finding that the mind has already sprinted ahead. The song refuses the easy...

Growing up changes the meaning of a late night. The Mack Brothers seize that feeling on “Sleepless in Seattle,” an indie rock single from Philadelphia brothers John and Matthew Mackara. The title comes from John’s own phrase for those anxious, can’t-switch-off hours, and the song’s stated concern is the friction between the past and the present. That premise hits hard because it is familiar without being...