asa-ren/workout in the early morning

I need to work from 11 this week except Wednesday, so I'm trying to get up earlier and run in the morning before work.

Advantage: feel good all day, can use time effectively after work (I mean, don't need to run in the cold night...), etc
Disadvantage: cold... sleepy, some time get sleep during work, it's hard to run faster as expecting pace, can't stay longer in bed, etc

This week is like this.

monday's running:
Ran in the Inokashira Park, and refered the pace from Steve's recommendation, so set @ 5:30/1km pace as recovery running for 8.5km, my legs were heavy but no matter when I got starting. My knees were fine. My today's prise is a cinammon pastry for breakfast.

mil: 8.5km, 2km as warm up, 4km as recovery run @ 5:30 pace, and 2.5km as cool down.
time: 47m07s
avg HR: 146-75%
avg Pace: 5:37/km
cal: 359kcal
starting time: 7:07am
location: Inokashira Park

tuesday's running:
Ran in the track in the Inokashira Park, and used a track to know pace and my body condition. I couldn't get pace up for 5minutes pace. I felt left side of back ache, but it's not painful so I think it's going to be fine soon. Just need stretch enough.

I got an acceptance card of Boston marathon!!! YEAH!

mil: 8.5km, 2km as warm up, 4km as easy run @ 5:00 pace, and 2.5km as cool down.
lap1: time: 5:05 avg HR:155-79% avg Pace: 5:20/km mil: 0.96km
lap2: time: 4:57 avg HR:160-82% avg Pace: 5:07/km mil: 0.97km
lap3: time: 5:03 avg HR:165-85% avg Pace: 4:54/km mil: 0.99km
lap4: time: 5:02 avg HR:165-85% avg Pace: 4:54/km mil: 0.99km
time: 47m21s
avg HR: 150-77%
avg Pace: 5:34/km
cal: 375kcal
starting time: 7:07am
location: Inokashira Park