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Turn on Windows 10 laptop sans ouverture it if external monitor is attached?

ayi

I work most of the time with my Windows 10 laptop (Lenovo X1 Carbon, 2012 1. gen model) closed and an external monitor attached.

To achieve this J'ai to start the computer by

opening the lid,
press the start button,
wait until it booted and
the external monitor is active, then
close the lid which puts the laptop into sleep after which
I can hit a mouse button or key to make it "start" (unsleep) again

Of course this is a bit silly.

On the other hand J'ai aussi work mobile, with no external monitor. One thing I can not compromise on is that the laptop indeed has to go into sleep when I close the lid (~ 15 years of conditioning).

Existe-t-il un better way to turn my laptop on if an external monitor is attached?

ayi

EDIT:

Wake-On-Mouse

Change what closing the lid does by setting it to 'Do Nothing':
Hit the ⊞ Win key and type lid, or else go:
Control Panel → Hardware & Sound → Power Options → System Settings
Plug in an external mouse.
Allez dans Device Manager or hit ⊞ Win + X followed by M
Double-cliquez sur the external USB pointing device.
On the Power Management tab, ensure that Allow device to wake computer is checked.
When you're finished using the built-in screen, cycle through projector options to enable monitor with:
⊞ Win + P
Don't use Shut Down when finished with the computer. Instead use one of:
Hibernate shortcut: ⊞ Win + X followed by U then H
Sleep or use ⊞ Win + X followed by U then S
Now vous pouvez keep the screen lid closed but turn on and use the laptop with an external monitor. To meet your last 'requirement', vous pouvez change the settings to Sleep settings so the laptop goes to sleep after a set amount of idle time:
⊞ Win and then type: sleep + Enter
Control Panel → Screen → Power & Sleep
Now you don't need to use the power button to turn it on or off.

Some other options:

You could have the laptop just stay on all the time (regardless of the lid) by following only Step 1 (above).
You could also schedule the laptop to startup (or shutdown) at the same time(s) every day.
Si vous êtes handy with tools and electronics you could also achieve this by modifying either:
the laptop access to the power button, or
laptop lid so it's functionality is more like a desktop machine.
You could get a docking station or USB Hub, with WOL so either:
an external device can wake it with a WOL Signal
plugging the laptop into the dock will wake the laptop if a network is present
WOL is disabled par défaut so you'll have to enable it in BIOS.

Since I'm new here I wasn't allow to includes my list of sources and examples, so I will try to post them in a separate comment or answer.