try to masturbate without ejaculation. when you reach the point that you are about to ejaculate, stop masturbating and squeeze your penis muscles to prevent the semen from coming out. Until you have discovered that you have seized the orgasm being reached, you may stop holding the squeeze. In most cases, semen will flow out gently from your penis. For the first round, the ejaculation is quite a bit. this is normal. this means you have achieved ejaculation without orgasm. I would prefer to achieve this all the time. Damn powerful! And you can go for another round or two and play with your penis with the semen as lubricant. the feeling is sensational. So that you can save money from using lubricant.
After orgasm, males will usually need at least 24 hours to recover and most sleep immediately after that. If you reached orgasm continuously (NOT RECOMMENDED if you are not young, harm your body in the long run), your recovery time will be longer, 48 hours or more. For ejaculation without orgasm, you will not feel so tired as compared to reaching orgasm.
The best is wet dream. Wet dream is a state of known orgasm while asleep that has ejaculation. And you will not feel tired from it. But it will make a mess of your bed. Wet dreams are the hardest to achieve since your brain needs to think of someone that is so sexually arousing you that your resting mind can't stop thinking of her. And you must have a lot of sperm in your sperm duct(not masturbate for a very long time) to achieve this.
Good health and good luck.