亲身经历,本人已解决,分享经验
原因
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According to knowledge that issue with parsec-fbf agent is not reported before Catalina 10.15.2 and each Catalina versions has his own versions of parsec-fbc agent, then we can conclude that issue is specific to the Catalina 10.15.2 only, until reported otherwise. So no need to concern if you have macOS 10.15.1 or older. Anyway, if you upgrade to 10.15.2 and get sleep issues, you have to check your system for issue described in this post. On some cases this might look like Buletooth issue but actually it's not, because when yo disable parsec-fbf agent, sleep works immediately again.
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解决方案:
终端运行:launchctl unload -w /System/Library/LaunchAgents/com.apple.parsec-fbf.plist
cd ~/Library/Caches
rm -R com.apple.parsecd
重启,在重新设置睡眠时间即可。