• 日夜にちや — day and night
• 徹夜てつや — staying up all night
• 夜半やはん — midnight
• 今夜こんや — tonight
• 夜中よなか — midnight / middle of the night
• 夜行やこう — traveling at night
• 深夜しんや — late night
• 夜明よあけ — dawn / daybreak

The top of the character shows a roof or building, while the bottom part is "evening." Together, they represent night — when people gather indoors to rest.