Other safety precautions are that you should never massage a dog that is suffering from fever, shock or cancer. Also, as you massage, avoid any areas of unexplained swelling. Also, remember that massage is not a substitute for proper veterinary care, it is a compliment to it, and it has many benefits for their health.
Some studies have shown that your deep sleep should at least be 20% of your overall sleep. It means that since most adults need 8-9 hours of sleep, they will need about 1.6-1.8 hours of deep sleep to feel fully functional next day. However, the time of deep sleep is changed and that's mainly due to the change in the sleep need of different group of people. For instance: Age Group.
Morning lark: It is not unusual for people to wake up when sunlight enters their eyes. Getting up early does not necessarily mean that you are losing deep sleep. The latter part of your night is spent largely in rem sleep. True deep sleep would be considered stage n3 sleep. This is a combination of what used to be called stage iii and four sleep. I don't believe that there is any significant correlation between getting up early and losing deep sleep which can occur even earlier in the night.