One of my biggest friends loves seeing a huge Ferris wheel. Who am I? And why?

Question

• Hi. My name is five letters long, usually.
• One of my biggest friends loves seeing a huge Ferris wheel from across the river.
• My grandfather has a cool-looking swinging thingy in the house.
• I have kind of an OCD when it comes to "p" and "a".
• Some of my friends still use roman numerals in the 21st century. Old-fashioned, I know...
• Some of us have a bird in the house. Luckily, they don't sing incessantly.
• I rarely sleep (perhaps, only once in a few years?), but you can make me sleep any time.
• I love training my arms, but not legs.
• Now that most of you have mobile phones, you don't need me as often as you used to. Sad!
• The longer I cry like a baby, the more you'll hate me and want to dump me. But you can't live without me.

• Most of you don't want to see me on Sunday mornings.

• English-speaking people may call my name when eveything has gone according to plan.

• Your parents used to tell you not to point fingers at strangers, right? But I can't help it. At least, I don't do it to strangers, though...

Answer 1

You are:

A Clock

Hi. My name is five letters long, usually.

Clock has 5 letters

One of my biggest friends loves seeing a huge Ferris wheel from across the river.

The palace of Westminster clock tower which houses Big Ben is across the Thames from the London Eye.

My grandfather has a cool-looking swinging thingy in the house.

Grandfather Clocks have pendulums (or is it pendula?)

I have kind of an OCD when it comes to "p" and "a".

am and pm

Some of my friends still use roman numerals in the 21st century. Old-fashioned, I know...

Many clock faces have roman numerals

Some of us have a bird in the house. Luckily, they don't sing incessantly.

Cuckoo clocks

I rarely sleep (perhaps, only once in a few years?), but you can make me sleep any time.

If they run down, or if you stop them

I love training my arms, but not legs

Not sure - perhaps the hands on a clock move, but the legs (if it has them) don't.

Now that most of you have mobile phones, you don't need me as often as you used to. Sad!

Fewer people have clocks as mobile phones tell the time.

The longer I cry like a baby, the more you'll hate me and want to dump me. But you can't live without me.

Alarm clocks are annoying but useful

Most of you don't want to see me on Sunday mornings.

We like a lie in

English-speaking people may call my name when eveything has gone according to plan.

Just like clockwork.

Your parents used to tell you not to point fingers at strangers, right? But I can't help it. At least, I don't do it to strangers, though...

The big hand is pointing to xxx and the little hand is pointing to yyy