Best time to inject sermorelin for GH pulse, morning or night?

Trying to get the timing right. The logic I keep reading is that sermorelin works with your natural GH pulse, and the biggest pulse is shortly after you fall into deep sleep, so a bedtime injection on an empty stomach makes sense.

But a few people swear by morning dosing on training days. What's your reasoning and what time do you actually inject? I'm currently doing it about 30 minutes before bed, at least 2 hours after my last meal.