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I'm a regular runner, who usually runs after work or mid-morning at the weekend, due to circumstances out of my control, my evenings have been taken from me, so the only place to run is the morning. Getting up in the morning is not an issue (early to bed and all that), it's more my heart rate. I train with my Garmin 305 and normally run within my zones quite happily, (well not happily some are bloody hard, but you get the picture). This morning (running at 6am) found it really tough to hit 85% max, it nearly killed me! So my question, does the time of the day effect your heart rate? Normally in the evening not a problem, but it felt like whilst my legs were definately up and running this morning, my heart was still snoozing!!! Is it just me, or is there some science behind this.