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Additional info: This is pretty common. During arousal, people’s hearts begin to beat faster and their blood pressure rises. After a certain amount of stimulation, people may experience orgasm — the peak of sexual arousal when all the muscles that were tightened during sexual arousal relax, causing a very pleasurable feeling that may involve the whole body. During orgasm, painkilling chemicals called endorphins are released into the bloodstream, causing intense pleasure and relaxation. Some people become very sleepy after having an orgasm. SOURCE: Why do guys feel tired after ejaculation ?

I'd be deeply suspicious of a free VPN. Fundamentally, a VPN is just tunneling your Internet traffic through someone else's computer. That gives an unscrupulous VPN operator a whole lot of opportunities -- spy on your traffic, inject ads or malware, etc. Reputable VPN providers wouldn't do this, of course, because they'd be dragged over the coals and go out of business when it was discovered. But if someone's not charging for a VPN service, I'd question what their motives are. It's possible they're just a privacy advocate with pure motives, but it could also be a lot more sinister.