There are a few reasons to feel sleepy after placing a request:
Your own energy is depleted and you need more energy for yourself. Please take more energy.
You are not choosing the right combination of energies. Please check the energy combination. Please note, cosmic serums are very much safe and do not harm if chosen incorrectly as they bypass your energy system but other chosen energies should not be incorrect.
You are not taking sufficient rest. Rest more to recharge naturally.
You are affected by some black magic. Check this article to get rid of black magic.
If you are a non-VK energy practitioner, you may be in a habit of using your old energy modality. In this case, your own energy gets depleted. Use only VK to send energy.
Using mind powers (hypnosis, NLP, visualization, etc.) to send energy will also deplete your own energy and you may feel sucked. So, allow VK to work. Just place the request and keep VK aside. It is a special feature of VK to sends energy from its own and not from its user.
If you are a depression patient, even then, you can feel sleepy because depression leads a person to feel more sleepy. You can add Mood Up Serum to get rid of this situation.
There may be some side effects of medicines which can make you feel sleepy. Take the All Clear Serum to resolve this issue.