[atmosx]

IMHO sleep + physical exercise can get you way further: Will make you work smarter, healthier and better thinker.

I'd say try to adjust your schedule to allow (at least) 7 hour good quality sleep[1] and at least 45-75 minutes of exercise daily.

You'll have 15:30 hours free :-)

[1] Getting a good sleep involves a good bed, freshly oxygenated room, right temperature, no room, no iphones/ipads/e-devices, no video-games, no-movies etc.

[pumpkinattwelve]

I meditate for about 30 minutes each night before sleeping and it does make up in multiples in lack of sleep. Without any scientific evidence but at least I feel more rested the next day.

7 hours of sleep with a full time job, a startup, kids and exercise? Is this even possible! One great life-hack we have is to sleep with the windows open and with thinner sheets. We both feel more refreshed the next day. And apart from the alarm clock, there are no devices :)

[atmosx]

Sorry mate, I didn't take "kids" into account :-)

Whatever works for you!!! Meditation it is!!! (will try also!).

[thenomad]

From experience, I'd say that good quality exercise is almost always a net time-gain over no exercise. The increased energy pays itself back.

Have you looked into High Intensity Training? That allows you to pack solid, proven exercise techniques into very short spaces of time.