In the cool seasons of the year I'll often go a full week or more between showers. My hair does eventually start looking a bit greasy, but I never really start

In the cool seasons of the year I'll often go a full week or more between showers. My hair does eventually start looking a bit greasy, but I never really start to smell. I've been showering every night before bed for about a month now, just to cool off as much as anything because we leave our windows open except on the very hottest days. The main thing I've noticed since I picked up the habit is that my scalp has been more itchy lately. Also if anything I feel like I'm more smelly now than before. And it's not just a summer thing, because this is the first year I've picked up this habit.