Slight cold is 23rd of 24 solar terms in winter. In this day, yang of both nature and human body begin to sink inside earth or the public region during cold air coming. The basic of life is protected under earth. That means you should do less and less to keep your energy stay inside your body.
The better yang of earth and human body is protected, the deeper the basic is. Then earth and human will avoid from being attacked by damage or diseases.
How to regimen in slight cold? You should be calm, make your will hide. Wear more clothes to keep warm in lest cold hurt stored energy. Prevent from sweat, or yang will go up to lose. Do not do too much sex which will make the basic of yang loose. Have a good and long time sleep which can enhance the storage in winter.
