気が付いたら Raspberry Pi の緑のランプが点いたままになっている．
多分 1ヶ月位電源を入れたまま．
VNC で接続してみたが，遅くて操作できない．

ssh で接続．

login as: pi
pi@192.168.1.34's password:
Linux raspberrypi 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sat Feb 16 18:34:59 2019 from 192.168.1.15

SSH is enabled and the default password for the 'pi' user has not been changed.
This is a security risk - please login as the 'pi' user and type 'passwd' to set a new password.

pi@raspberrypi:~ $ sudo shutdown -r now

“sudo shutdown -r now” で再起動して対応．