When I helped my wife's address change at a night,

she could almost finish making a information person list of senders in the midnight.

Wife: "I have to send this e-mail to concerned people before the start of tomorrow early morning"

Ebata: "Early in the morning of tomorrow? Should I send it now?"

Wife:"Such late night, it is a rude manner isn't it?"

Ebata:".....What?"

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When I asked my wife the reason, she told me that the persons in her workplace make their smart-phone

"turn on the function to inform the arrival of mail by vibration or voice"

Since they use the smart-phone as an alarm clock, if the mail arrives in the middle of the night, the smart-phone wakes them up.

(To be continued)