Night Emision is common at the age of adolescence.
Thanks for your query,based on the facts that you have posted it appears that you have problem of night emission and your semen count is lower than normal, what is termed as Oligospermia
It is natural to get night emission at the age of adolescence and do not require any treatment ,it gets cured itself without any medication.
As regards your query to raise sperm count
,you have not mentioned your sperm count in your query.
Following general measure will help to increase the sperm count.
1) Practice regular exercise for 45 minutes followed by meditation
for 1/2 an hour in the morning.
2) Take high protein diet rich in vegetables and fruits and Vitamin A
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking
Hope I have answered your query ,please feel free to ask if you have more questions ,I shall be happy to help you
Thanks and Regards.