When you reach 40 years old, this is the time that the effects of exposing yourself in the sun during your youth. Red spots in your skin will appear when you reach 40. The decrease of the collagen is also noticeable at this age, your skin will get sag and retaining of the moisture will also become a problem and as your skin is showing this damage, you would also lose the glow that you had once when you were still young.
Even though it is hard to make time of yourself to sleep but you have to know that sleeping is very important and you have to sleep 7 to 8 hours every night, because it repairs the skin itself. You can also use a day cream that contains SPF 15 to 30 and use moisturizer with peptides and coenzyme Q10, these two can pump up skin resiliency.