Monitor your Gmail login activity

If you worry about some other people may log in your Gmail account and spy  your email, you can check your Gmail login activity.  After you sign in your Gmail account, at the right bottom of your Gmail, you can find:

"Last account activity: 1 hour ago

Details"

Click the link in detail, you can  see|:

Activity on this account This feature provides information about the last activity on this mail account and any concurrent activity. Learn more

This account does not seem to be open in any other location. However, there may be sessions that have not been signed out. Recent activity: Access Type [ ? ] (Browser, mobile, POP3, etc.) Location (IP address) [ ? ] Date/Time (Displayed in your time zone)

Check if any abnormal activity.